You do not want to get the sealer between the rubber boot and on the plastic pipe.
Replace rubber boot roof vent.
See other blogs for a proprietary vent flashing repair kit and a repair using a boot flashing with the roof pan trimmed off.
Slide the new boot over top and make sure it is sealed completely between the old and new boot.
When this happens there is a chance that water will enter your home through the damaged roof boot.
However over time they will begin to tear and gap.
A gasket less two piece pipe boot repair system designed to repair the leak around the vent pipes that penetrate the roof.
In simplest terms a new vent pipe boot flashing is slid over the top of the existing one and the top edge of the pan is lapped beneath the overlying shingle course.
2 in and 3 in x 9 75 in plastic vent and pipe flashing.
This old house general contractor tom silva shows how to create a watertight seal around a vent pipe.
It is imperative at this point that you repair the roof boot.
Designed for all standard roof pitches 3 12 to 12 12.
See below for a shopping list and tools subscribe to.
Apply a liberal amount of silicone sealer to the old rubber boot.
Existing pipe boot repair and preventative maintenance the perma boot is a gasket less two piece pipe boot repair system designed to permanently repair the most common type of roof leak the leak around the vent pipes that penetrate your roof.
Labor assuming this is a shingle roof typically about 250 400 to do 4 boots on normal slope roof likely 100 or so higher for steep roof.
I put in enough material that it squished out around the entire outside perimeter.
Item 1262068 model pbr 312 3n1 bk.
Easy installation and no tools required.
About 15 30 per boot parts depending on whether you go with the cheapest all rubber or silicone which i do not recommend except inside bathroom kitchen vent hoods or metal cone flashing with rubber boot rim longer lasting especially in heavy snow ice country and also in areas with baking sunshine.
I ve used this repair on several roofs over the years.
The perma boot can also be used as a very effective preventative maintenance product to guard.
If split then yes it needs replacing though a good wrap with waterproof duct tape or bitumastic caulk will keep it intact and dry until a roofer can fix it.